No.550
You don't say what the tiny things that you get anxious over are, but that's ok.
I find that an obsession with something will make your mind so preoccupied that it simply doesn't care while in usually stressful situations. Hobbies and interests, new ventures, an interesting area of study, new friends and such are all things which, when taken full-on, will be your mind's focus even when not actively engaged in it.
You may also want to consider good old apathy. 'I'm not going to see this person again so I just don't care about acting in any particular way as not to stand out'
